EasyPhysicsHigh School (11–12)Heat & Thermodynamics › Laws of ThermodynamicsNumericalBoard ExamAPA-LevelIB
A gas at a steady 1.4 × 10⁵ Pa is squeezed from 8.0 to 3.5 litres…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A gas at a steady is squeezed from to litres. Find the work done by the gas. Who does the work, the gas or its surroundings?
Need a reminder? The key ideaShow
Work done by a gas is the area under its path on a pressure-volume graph. At a steady pressure ; along a straight line, the average pressure times ; at a steady temperature . Expanding gives positive work, squeezing negative. .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. .
Step 2. .
Answer: : the surroundings do of work on the gas.
Watch out. A squeeze always gives negative work in our convention.
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